By Jennifer Sieg Aidan Rushby can still remember the guilt he felt the day he told investors he was no longer in it for the long run. Carefully drafting a letter to shareholders, he recalled telling himself: “You have to be honest.” Now proud co-founder and chief executive of the used car finance mobile app, Carmoola, Rushby believes the seeds of his now successful business were laid in the failure of his first. Rushby embarked on his first business journey in 2013 when he tapped into the consumer property space with a renter-focused mobile app, known at the time as Movebubble. There was enoug…